45 results about "Master equation" patented technology

The invention discloses a method and a system for testing local communication equipment of a power utilization information acquisition system, and a master station. The method comprises the following steps that: the master station sends a meter reading command to a data concentrator, wherein the meter reading command is an energy meter reading command; the master station receives first confirmation information from the data concentrator; the master station sends a reading data command to the data concentrator to ensure that data of an energy meter can be conveniently read by the data concentrator, wherein the reading data command is an energy meter reading data command; and the master station counters the reading success rate of the data concentrator on the data of the energy meter. By the method and the system, the performance of the local communication equipment of the power utilization information acquisition system can be conveniently and efficiently tested.

The invention provides an electric power line fault point location method and a detection terminal, a master station and a location system thereof. The detection terminal uses current, sound, shock wave, magnetic field, infrared ray, ultraviolet ray, visible light, air pressure and other sensors to detect physical quantity capable of reflecting electric power line short circuit fault characteristics and parameter data of the physical quantity related to the electric power line operation state and locally recognize the fault of the electric power line and determine fault time. After the detection terminal recognizes the fault of the related electric power line, the detected data are transmitted to the location master station. The location master station comprises a data receiving component, a data storage component, a data processing component and a human-computer interaction component. The position of the electric power line fault point is calculated according to the data provided by the detection terminal and the position of the detection terminal corresponding to the data so as to realize timely and accurate location of the electric power line fault and overcome the defects of the fault location system in the background technology.

The invention discloses a power distribution network self-healing control method combining master station and local control; the existing resources of local feeder line automation terminal informationcan be utilized, and self-healing control of automatic mutual cooperation of a power distribution network master station and a voltage time type feeder line is achieved, so that the method is suitable for fast positioning of faults suitable for various power distribution network topologies, and power distribution network fault positioning, fault isolation and post-failure power supply recovery combining the power distribution network master station and the local power distribution automation terminal control are realized.

A single-phase grounding fault locating method for a distribution network without a master station of the invention comprises the following steps: (1) each distribution terminal detects the zero sequence voltage value of a distribution network, and judges whether there is a single-phase grounding fault; (2) when there is a single-phase grounding fault, each distribution terminal takes the derivative of zero sequence voltage, compares the polarity of transient zero sequence current with the polarity of the derivative of zero sequence voltage, and identifies a single-phase grounding fault line; (3) a line meeting the condition that the polarity of transient zero sequence current and the polarity of the derivative of zero sequence voltage are opposite is selected as a fault line, and each distribution terminal sends a grounding fault locking signal containing level information to a higher-level line distribution terminal; (4) the distribution terminal at the fault point does not receive a grounding fault locking signal, and acts first to remove the grounding fault, and the distribution terminals upstream of the fault do not malfunction; and (5) if the distribution terminal at the fault point fails to remove the fault in time, the higher-level feeder distribution terminal delays the action exit gradually according to the received locking signal. Through the method, a grounding fault point can be located accurately even when a distribution terminal on a switch loses communication connection with a distribution monitoring master station system.

The invention provides a Bluetooth communication method of electric power metering on-site test data. The Bluetooth communication method is implemented by a mobile operation terminal serving as a master station and on-site test devices serving as slave stations. All on-site test devices are provided with address codes. A master-slave half-duplex communication method is adopted for communication between the master station and the slave stations for data exchange. Establishment and termination of communication links between the master station and the slave stations are controlled by information frames sent by the master station. An information frame is composed of seven fields: a frame start character, a slave address field, a control code, a data field length, a data field, a frame information longitudinal check code and a frame terminator. Each field of the information frame is composed of bytes. Data transmission and communication between the master station and the slave stations is performed according to set statutes. According to the method, data acquisition is simple, and communication statutes are concisely and clearly defined. The Bluetooth communication method can be implemented on site conveniently, can be used to automatically, quickly and accurately acquire electric metering on-site test data. The method is of strong applicability and good generality, and is convenient for promotion.

The present invention relates to a method for determining an edge profile of a volume of a photoresist after a development process. At first, the volume of the photoresist is divided into cells. A chemical master equation is set up which reflects the stochastic kinetics of chemical reactions proceeding in cells of the volume of the photoresist during the development process. The chemical master equation is solved for a given development time on the basis of a Gillespie algorithm in order to determine developed and non-developed cells of the volume of the photoresist at the end of the development process. Finally, the edge profile of the volume of the photoresist after the development process is determined on the basis of a cluster of non-developed cells.

The invention discloses a WAMS low-frequency oscillation identification function test system and a WAMS low-frequency oscillation identification function test method. The test system comprises an IEEE three-machine nine-node system which is built on a real-time digital simulator RTDS and used for simulating the running state of a power system under a preset low-frequency oscillation event, and a wide-area measurement system WAMS which includes multiple PMUs (Phasor Measurement Unit) and a master station system. The PMUs are connected with the three-machine nine-node system and the master station system, and are used for collecting dynamic phasor data of the simulated power system and uploading the dynamic phasor data to the master station system. The master station system is used for receiving the dynamic phasor data and analyzing the dynamic phasor data to identify the low-frequency oscillation event of the power system. The result of the master station system's analysis of the dynamic phasor data is collated with the preset low-frequency oscillation event to determine the performance of the low-frequency oscillation identification function of the WAMS. With the system and the method of the invention, the low-frequency oscillation identification function of the WAMS can be tested.

The present invention discloses a system and a method for test of a master station and a substation of an intelligent transformer substation phasor measurement unit (PMU). The system comprises a PMU tester, a PC substation client and a PC master station client. The PC substation client controls the PMU tester to send a current and a voltage which have time marks to a PMU collection unit, the PMU collection unit centrally stores the current and the voltage in the PMU collection unit and then sends the current and the voltage to a dispatching master station; data in the PMU collection unit are transmitted back to the PMU tester after being processed by the PMU collection unit; the PC master station client analyzes current and voltage signals, uploaded to the master station, of a PUM device to form a master station data file; and master station data and substation data are correspondingly compared through analysis of the PMU tester to complete error calculation of the current and voltagedata. The technical problem of master station and substation joint debugging testing in a current intelligent transformer substation PMU device test is solved, and validity and dependability of the test of intelligent transformer substation phasor measurement unit are improved.

The invention discloses a bidirectional allowable protection method employing a master station to identify a dynamic topology for a power distribution circuit. The method comprises the steps of firstly, dividing an FTU (Feeder Terminal Unit) into a boundary FTU and an intermediate FTU, and determining whether the boundary FTU is an initial-end FTU or a tail-end FTU or not by the master station through dynamic topology identification; judging whether an allowable signal is sent to an upper-level FTU and a lower-level FTU according to an overcurrent whether can be sensed by the FTU or not; controlling corresponding circuit breakers to do action according to the overcurrent whether can be sensed by the initial-end FTU, the tail-end FTU and the intermediate FTU and the allowable signal whether is received or not within a stipulated time; and outputting the actions of the circuit breakers if the overcurrent exists within time () after a fault to achieve fault protection between the initial-end FTU and an outgoing line circuit breaker. The method utilizes a network communication technology to complete action information exchange among adjacent levels of protection, the action delay brought by multi-level matching is effectively shortened, the fault is rapidly isolated, and the fault danger is reduced.

The invention relates to a method for accessing data to an IEC61850 fault recording master station from a converter station recording system. The method is characterized by comprising the steps that fault recording data areas of a professional fault recording device and all control and protection devices in a converter station are monitored by adopting a network directory mapping mode based on virtual modeling technologies, the professional fault recording device and all of the direct current transmission control and protection devices with a built-in fault recording function in the converter station are modeled into intelligent fault recording logic devices (LDs) conforming to IEC61850 standards, an intelligent gateway detects file generation of the fault recording data areas of all of the devices in real time and is responsible for real-time efficient communication with a fault recording master station system adopting the IEC61850 standards in a dispatching center, thereby ensuring the power grid dispatching center to acquire operational analysis data of key operations, abnormal situations and the like in the direct current transmission converter station timely and rapidly.

The invention provides a three-dimensional imaging tunnel geological advance forecaster and a forecasting method. The three-dimensional imaging tunnel geological advance forecaster comprises a host control terminal, a master station, an acquisition station and a triggering station; the master station is used as the management unit of a station, performs communication with the acquisition station, the triggering station and the host control terminal through wireless WiFi so as to transmit sampling data, and manages the triggering time of the triggering station and the acquisition state to be synchronous through a wireless communication manner; and a master station power management unit comprises a charging and discharging management module, a voltameter and a lithium ion battery. The three-dimensional imaging tunnel geological advance forecaster has the advantages that: all data interaction is carried out through wireless transmission, compared with the traditional wired data acquisition system needing a lot of cables and difficult in field wiring, the three-dimensional imaging tunnel geological advance forecaster does not need a lot of cables, and is convenient to install, small, portable and simple in field configuration; the synchronous sampling time error range of multiple acquirer is within 1-3 sampling points; and requirements of the tunnel geological advance forecaster on the time precision are satisfied.

The present invention discloses a wind farm single-ring network multi-point fault and poor contact/communication attenuation rapid positioning method. The method comprises the following steps that: a master station periodically sends heartbeat packets, after a sub-station receives the heartbeat packets, the sub station adds the state information of the sub station into the heartbeat packets and forwards the heartbeat packets to a sub station of a next level until the heartbeat packets of all sub station state information are returned to the master station, if the master station receives the heartbeat packets with all sub station state information, a network is normal, if the master station does not receive the heartbeat packets with all sub station state information, a single-ring network is failed, the last sub station which does not return the heartbeat packets is a first fault point, the heartbeat packet record recorded in the sub station is recorded at the first fault point, a next fault point is rapidly positioned, the steps are repeated to position multiple fault nodes, and according to the data loss packet number information in the heartbeat packets returned by the sub station, the sub station with poor contact/communication attenuation is positioned.

The invention provides a closed loop testing method of an integrated anti-mistake system of a master station and a substation and a closed loop testing system. The closed loop testing method includessteps that a master station anti-mistake system carries out an anti-mistake calibration on the basis of a preset testing case set, and sends a remote preset request to a preset simulation substation;the simulation substation responds a substation anti-mistake checking request sent by the master station and returns the checking result to the master station anti-mistake system through a preset power grid anti-mistake information collecting convention and interactive mode. Compared with the prior art, the method and the system can avoid many links from operation of regulators to correct responseof a substation device to the whole process through not interlinking with five-defense system of the actual substation system, thereby simplifying the structuring of the closed loop testing environment of the integrated anti-mistake system of the master station and the substation while also meeting the demand of function verification.

The invention discloses a method and a system for processing the asset information of a communication unit by a master station of an acquisition system, which comprises the following steps: obtainingthe identification information of a communication unit which is qualified in detection, and establishing the asset information file of the communication unit; the associated terminal information of each communication unit in operation is bound with corresponding identity identification information to perform asset relationship binding, and an asset information database of the communication unit isestablished; issuing a read call instruction to obtain the identity information of each communication unit; determining whether each of the acquired communication units is a conforming product; comparing the identity information of each communication unit in the qualified product and the identity identification information in the asset relationship binding data in the asset information database of the communication unit according to the assigned terminal information, and obtaining a comparison result; Generating an identity information change event when the identity information is inconsistent; the asset relationship binding is performed by changing the identity information of the communication unit corresponding to the identity information changing event and the associated terminal information.

The invention provides an interaction method and system for a master station and sub-stations of an operation and maintenance system. The method includes the following steps: when the master station receives one or more requests for obtaining operation and maintenance signals sent by a request initiation sub-station, acquiring a signal providing sub-station respectively corresponding to each request according to a pre-generated forwarding table; and enabling the master station to feed back the operation and maintenance signals acquired from the signal providing sub-station to the correspondingrequest initiation sub-station, wherein the forwarding table includes a list of signals selected according to a transformer substation total station configuration description file sent from the sub-station. By adopting the method, the communication with the master station and the sub-stations of the system does not need to select a signal telecontrol data communication gateway forwarding table, artificial peer-to-peer is also not required between the master station and the sub-stations, the debugging efficiency that the operation and maintenance sub-stations access the master station can be greatly improved, and a plug and play function of the operation and maintenance system can be realized.

The invention discloses a simulation test method and system for massive measurement data. The method comprises a step of determining the number of virtual power distribution terminals and connecting all virtual power distribution terminals to a tested master station based on the quantity of measurement data to be generated, a step of grouping each virtual power distribution terminal and controlling the virtual power distribution terminals in each group to simulate distribution network operation data to generate the massive measurement data, and a step of allowing each virtual power distribution terminal to parallelly upload the massive measurement data to the tested master station and generating a performance analysis result of the tested master station. According to the invention, the distributed packet data management is applied to the virtual power distribution terminals, the massive measurement data is generated, the tested master station is parallelly visited through multiple threads, the test level of a master station system and test work efficiency can be greatly improved, and a standardized, scientific and real test result can be provided for test evaluation.

The present invention relates to the field of power grids, and particularly relates to an optimization method for active reporting of a power failure event concentrator in a transformer area. The method of the present invention uses a concentrator to monitor a voltage anomaly for screening effective power failure information. After the concentrator monitors the voltage abnormality, the concentrator collects a set of concentrator AC sampling voltage again. After a power failure event is determined initially, the power failure event is recorded and the total meter voltage in a transformer area is interrogated actively. After the power failure event in the transformer area is judged initially, the power failure event is reported to a master station. After a collecting master station receivesthe power failure event, the total meter voltage in the transformer area is copied for secondary judgment. If the power failure event in the transformer area is also determined in the secondary judgment, the master station sends the power failure event to a distribution network repair platform to arrange corresponding repair working personnel. The method of the present invention can improve the reliability of reporting the power failure event in the transformer area, save the resources of the master station, and strive for the time for the repair work of power failure.

The invention relates to a method for accurately judging an earth fault moment of a small current earthing system master station. The method comprises the steps of: 1, acquiring an earth fault waveform by using the system master station; 2, computing an initial difference gear I of the faulted waveform; 3, acquiring a current difference gear D of the faulted waveform; 4, finding suspicious fault moment points; 5, judging continuous transient mutation; and 6, calling back the suspicious fault moment points. From the technical scheme above, it can be known that the probability of finding the small current earth fault moment point can be improved, and thus the transient polarity, amplitude and similarity computed based on the found fault moment point are accurate and valid.